How to change mode group:
When it is low mode at Any group, turn on for about 5 seconds, after flashlight flashing automatically, half press the switch to change different group immediately

How to customize your flashlight:
We support customization of the circuit and LED.Pls contract with us if you want customization.And a little money will be addedOptional LED: XML2 U2-1A / XML2 T6-3B / XML2 T6-4C / XML2 T5-5B / XML2 T4-7A